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INDEX.

A. Page.

Acidity, soil, nature of 45

Actinomycetes, description of 158

in soil, characteristics of colonies 172

classification 165

dark-brown type ; 170

distribution 173

growth on glycerin and other media 166, 167

history of studies 160

morphology 165

pink-spored type 171

potato-scab type 170

significance 174

study of 157

types most abundant in soil 168

uncommon types in soil 172

Agar for qualitative bacterial soil analysis 116

formula for plating soil bacteria 109

vs. gelatin for plating soil bacteria 109

Agronomy Department, notes on work of 17

report of , 35

Albion, spraying experiments at 449, 452, 453, 454, 455

Anderson, Rudolph J., absence on military service 10

Animal Industry Department, notes on work 18

report 63

Anthony, R. D., bulletins by 561, 628

Aphides, newly hatched, control in apple orchards 413

Aphides (See Plant lice).

Aphis avenae, identification characters 416, 417

pomi, identification characters 415, 416

sorbi, identification characters 415, 416

Apple orchards, plant lice in, notes on 24

Appleton, spraying experiment at 446

Artichoke, globe, botanical classification 620

cultural details 622

culture of 28, 619

history of 620

insect and fungus troubles of 626

uses of 626

varieties of 620

winter protection of 626

yield of plants 621

B.

Babcock glassware, tests of...., 30

Bacillus cereus, characteristics of 134

erium, characteristics 132

, characteristics 134

simplex, characteristics 136

Backus, F. L., spraying experiment in orchard of. . ..'. 447

Bacteria, classification card in study of 117

control in market milk by microscope count 244

plan of work 246

results at Geneva 251

results at Hobart, N. Y 247

in milk, agar colonies.and microscope count 209

counting 685

data from quantitative studies 207

effect of milking machines on 261

lactose agar colonies and microscopic count 222

methods for quantitative study 204

plate counts and microscope counts 266

soil, agar for qualitative study 116

methods adapted to study 102

plating methods 103

Bacteria, non-spore-forming, distribution in soil 150

history of studies 143

in soil 143

study of 141

significance in soil 154

number in milk 200

soil, applicability of group number in study 118

microscopic examination 21

plating for qualitative analysis 114

technic for qualitative study 116

Bacteria, spore-forming, in soil 127

significance in soil 138

Baer, William W., absence on naval service 10

bulletin by 35

Barker, J. F., bulletins by 35, 47, 55

resignation as Agronomist 9

Beans, field, culture of 651

desirable varieties 654

troubles of 653

Beckwith, John, spraying experiment in orchard of 451, 455

Blackheart and aeration of potatoes 277

of potatoes stored in sealed jars 281

from shipping conditions 315

in storage 675

Page.

Blackheart of potatoes, notes on • 22

previous work 279

produced at low temperatures 284

relation to seed potatoes 317

Bosworth, Lloyd A., service as Assistant Chemist 10

Botrytis allii cause of neck-rot disease of onions 350

description of 350

Breed, R. S., bulletins by 181> 244

Brew, James D., bulletins by 200> 244

Buchholz, A. B., assistance in spraying experiments 443

Building needs of Station 13

new, erection of >

Bulletins, edition of 15

for 1917, list of 31

Bulletins reprinted, No. 429, 63; No. 431, 413; No. 432, 561; No. 433, 586; No. 435,
619; No. 436, 277; No. 437, 319; No. 438, 181; No. 439, 200; No. 442, 460; No.
443, 244; No. 444, 483; No. 445, 9.
Bulletins reprinted, Popular: No. 429, 661; No. 432, 666; No. 433, 671; No. 436,

675; No. 437, 680; No. 439, 685; No. 442, 694; No. 443, 698.
Bulletins reprinted, Technical: No. 57, 91; No. 58,127; No. 59,141; No. 60,157;

No. 61, 47; No. 62, 55; No. 63, 628.
Burrows, Lynn, spraying experiment in orchard of 455

C.

Carbonates, apparatus for determination of 17, 55

Cherry leaf-beetle, activities during 1916 504

adult of 509

artificial control of 545

bibliography of 553

classification 486

coloration changes 511

development of larva • • • • 530

directions for control 550

dissemination of 541

distribution of 492

duration of life 526

egg of 506

emergence of adults 510

factors favoring dispersion 501

fall feeding habits of adult 511

food plants 490

hibernation of adult 511

• historical notes 486

incubation and hatching of egg 526

larva of 507

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