1906-1907.] A ddress by the President. 43 1 



possible, and get some means of protecting them from dust 

 when not in use. There is nothing better than a bell-glass with 

 its rim fitted in a groove on a wooden stand, on which fittings 

 could also be made for any additional eye-pieces or other 

 apparatus. 



The following photo-micrographs were then shown upon 

 the screen : — 



CELLULAE CRYPTOGAMS. 



FUNGI. 



Phytophthora infestansx 180. 

 Mucor mucedo x 23. 

 do. x69. 



Puccinia graminis— Teleutospores x 84. 



do. Uredospores x 84. 



do. ^cidiospores x 84. 



Aregma bulbosum x 84. 

 Aregma gracile x 84. 



ALGiE 



Schizophycece {Fission Algce) — 

 Chroococcus coherens x 540. 

 Nostoc commune x 540. 

 Cylindrospermum macrospermum x 270. 

 Gloeotrichia natans x 195. 



DiatomacecB {Diatoms) — 



Navicula didyma x 500. 



Navicula lyra x 500. 



Gomphonema geminatum x 450. 



Coscinodiscus elegans (?) x 1000. 



Systephania corona x 500. 



Craspepodiscus elegans x 250. 



do. (another view) x 250. 



Asterolampra rotula. 



Arachnoidiscus Ehrenbergii x 120. 

 Conjugate {Conjugating Algce) — 

 Spirogyra in conjugation x 210. 



Zygnema concinnum, showing protoplasm passing, x 195 

 Spirogyra bellis, showing zygospores, x 270. 

 Spirogyra crassa, showing nucleus, x 540. 

 Chloropki/cew {Green Algce) — 

 Volvox globator x 30. 

 Sphseroplea annulina fruiting x 245. 

 Pithophora Kewensis fruiting x 23. 



ffidogonium pulchellum, showing oogonia and male cells, x 220 

 ^dogonmm flavescens, showing oogonium and dwarf male, x 540 

 btigeoclonium fastigiatum in fruit x 270. 

 Vaucheria repens x 8. 

 Vaucheria terrestris, showing hornlet and sporogonium, x 540. 



