LIST OF ILLUSTRATIONS 



XV 



FIGURE 



243. A Poor Reservoir 



244. Diagram : Thirty Years of Diphtheria in New York State 



245. Diagram : Story of Epidemic of Septic Sore Throat at Rockville 



Centre, L. I. 



246. Model Dairy Cow 



247. Model Dairy Stable . 



248. Map Showing Number of Dairy Cows on 



April 15, 1910 

 Agar Plates 

 Bacteria and Mold 



249. 

 250. 

 251. 

 252. 

 253. 

 254. 

 255. 

 256. 

 257. 

 258. 

 259. 

 260. 

 261. 

 262. 

 263. 

 264. 

 265. 

 266. 



Milk Diluted to j^Vo 



Bean Plant .... 

 Photograph of Bean and Pea 

 Parts of Bean Seed 

 Diagram of Corn Seed 

 Sunflower Seed . 

 Squash Seed 

 Germination of Bean . 

 Bean Plants 

 Sections of Bean Root 

 Root Hairs .... 

 Root Cap .... 

 Bean Roots 



Fibrous Roots of Buttercup 

 Cross Section of Bean Leaf 

 Leaf Skeleton 



267. Epidermis of Leaf 



268. Germination of Corn . 



269. Rootlets of Two Corn Plants 



270. Corn Plant .... 



271. Maple Seedlings . 



272. Microphotograph of Corn Stem 



273. Stem of Corn 



274. Older Maple Seedlings 



275. Seedlings .... 



276. Older Horse-Chestnut Seedlings 



277. Wheat Seedlings 



278. Roots of Radish . 



279. Roots of Beet 



280. Alfalfa Root 



281. Aerial Roots of Ivy 



282. Potato 



Farms and Ranges 



i'aci: 



241 

 242 



243 

 247 

 248 



249 



250 



251 



252 



259 



260 



260 



262 



262 



262 



264 



267 



268 



269 



269 



270 



271 



273 



273 



274 



277 



277 



278 



279 



279 



280 



280 



281 



281 



28? 



282 



283 



283 



284 



285 



