INDEX. 



413 



Pledge, J. H., 189 



Plessner,H.,252 



Plicaria leiocarpa, 176 



Plum-trees, " Wither Tip " of, 73 



Fluteus admirabilis and Tvbaria furfur- 



acea, 283 

 Pohlman, A. G., Double Ureters iu Pig and 



Man, 28 

 Polimanti, O., Colour-sense in Fishes, 



240 



— Colour-sense in Octopus, 248 

 Politis, loannes. Greek Mycology, 182 

 Polychffita of Northern Coasts of Spain, 



146 



Polychsets, Fossil, 352 



Polyclads, Japanese, 255 



Polypori, Ceylon, 181 



Pond-life Exhibition, 195 



Poria, 380 



Portevin, A. M., and M. Garvin, Experi- 

 mental Investigation of the Influence 

 of the Rate of Cooling on the Harden- 

 ing of Carbon Steels, 385 



Portier, Paul, New Theory of Symbions, 

 236 



Potato Blight, 288 



— Disease, Phytophthora infestans, 175 



— Leaf-roll, 72 



— Scab, Common, 382 



— Tuber, Potential Parasites of, 71 

 Poultry, Winter Egg-production in, 330 

 Poynter, C. W. M., Wound Healing in 



Early Embryo of Chick, 25 



Prashad, B., 32, 41, 43, 47, 147 



Pratt, H. S., Cuticula and Sub-cuticula of 

 Trematodes and Cestodes, 44 



Prenant, Marcel, Rhabdites of Turbellaria. 

 148 



Presidential Address, 1917-18 : The Limi- 

 tations of Microscopy. By Joseph 

 E. Barnard, 1 



Proceedings of the Society — 



Meeting, December 18, 1918, 83 



— January 15, 1919, 84 



— February 19, 1919, 88 



— March 19, 1919, 187 



— April 16, 1919, 191 



— May 21, 1919, 194 



— June 18, 1919, 302 



— October 15, 1919,391 



— November 19, 1919, 393 

 Primitosis and Syndiseresis, 366 

 Prothallia of Lycopodium in America, 54 

 Protococcoidea, 170 



Protomarattia, a Few Genus of Marat- 



tiacese, and Archangiopteris, 164 

 Protoplasm and Cell Contents, 234 

 Protozoa, Ciliate, from Uruguay, 49 



— (Fauna Groenlandica), 272 



— of Manila, 46 

 Protula meilhaci, 352 



Prowazek, S. V., Races of Colpidium col- 

 poda, 259 



Ptergynandrum fili/orme (Timm) Hedw., 



Vegetative Increase of, 165 

 PsilotacesB, Gametophyte Generation of 



the, 54 

 Psilotum, Gametophyte of, 54 

 Pteris, 269 



— sulcata L., Apospory in, 161 

 Ptenjgophora ealifoinica. Age of, 61 

 Puccinia Corteyi Ran, New Species of 



■ Rust, 282 



— on Carduacese, 64 



— Parasitism of, 179 



— Bubnitens and its Mcial Hosts, 178 

 Pulsation, Rhythmic, of Ophiuroids, 150 

 Purser, G. L., Brain and Cranial Nerves 



of Dogfishes, 340 

 Pyrenomycetes, 281 

 Pyrosoma, Taxonomic Study of, 246 

 Pyzidicula operculata, 258 



Q 



Quantitative Method in Biology, 339 

 Quelle, — , the Bacillariacesa of the 



Numburg Stream, 375 

 Quercus, Ray-system of, 52 



R 



Rabaud, E., Colour Adaptation in Spiders, 

 40 



— Food of a Millipede, 39 



Raff, Janet W., Abnormality in Australian 

 Crayfish, 350 



Ramsbottom, J. K., Narcissus Disease, 185 



Ranoievitch, N., New Species of Rust, 

 Puccinia Corteyi Ran, 282 



Ransom, B. H., and W. D. Foster, Life- 

 history of Ascaris lumhricoides, 42 



Rasmussen, Andrew T., Blood and Blood 

 Gases in Hibernating W'oodchuck, 241 



— Nerve-cells of Woodchuck during Hiber- 



nation, 242 

 Rat, Diet and Testicular Degeneration in, 

 234 



— Norway, New Meudelian Variety of, 



133 

 Rathburn, Annie E., Fungus Flora of Pine 



Seed-beds, 65 

 Rats, Albino, Feeding Sudan to Young, 



128 



Inbreeding and Body Weight in, 128 



and Fertility in, 128 



and Sex- ratio in, 127 



Effects in, 332 



— QSstrous Cycle in, 24 



— Underfeeding, 333 



— White, Influence of Gonads in, 233 



2 F 



