JOUENAL 



OF THE 



ROYAL MICROSOOPIOAL SOCIETY. 



APRIL 1886. 



TEANSACTIONS OF THE SOCIETY. 



VII. — The President's Address. 

 By the Eev. W. H. Dallinger, LL.D., F.R.S. 



{Annual Meeting, 10th February, 1886.) 

 Plates VII., VIII., and IX. 



A COMPREHENSIVE and impartial review of the results of a year of 

 work accomplished by a scientific use of the Microscope would be 

 no doubt of considerable interest and of some value. But it would 

 be a task impossible of accomplishment in an address such as I 

 have to-night the honour to give. The mind most familiarized with 

 the vast area of activity and research in this direction would be the 



EXPLANATION OF PLATES VIL, VIII., and IX. 



Plate VII, 



Fig. 1. — Hetcromita rostrata, showing nucleus n, x 3000. 

 „ 2. — Polytoma uvella, showing nucleus n, x 1400. 

 „ 3. — Tetramitus rostratus, showing nucleus ii, x 1400. 

 „ 4. — Dallingeria Drysdali, showing nucleus n, x 3000. 

 „ 5-8. — Spore-sacs of the above in the act of emitting spores. 

 „ 9. — Amoeboid condition of T. rostratus before genetic fusion (flagella «), 



X 1200. 

 „ 10. — Ditto after the blending of two forms just before the union of the 

 nuclei, x 1200. 



Plate VIIL 



Fig. 1. — Nucleus of P. uvella when it has attained full size by growth from 



the germ, x 6000. 

 „ 2. — Ditto with nuclear wall shown, x 6000. 



„ 3. — Ditto showing internal development or plexus-like structure, x 6000. 

 „ 4. — Ditto after complete internal development, giving origin to body- 



sarcode and flagella (a), x 6000. 

 „ 5, 6. — Further stages of the development of sarcode (flagella 6 and c), 



X 6000, and 6000 reduced one-half respectively. 

 Ser. 2.— Vol. VI. O 



