88 PKOCEEDINQS OF SOCIETIES. 



developed, just as in other instances of abnormal growths a piece of 

 skull with hair, or part of a jaw with teeth, might be produced. 



Mr. Charles Stewart stated, with respect to the one shown by Dr. 

 Matthews, that it was evidently injured ; it had escaped from the 

 envelopes, and there might consequently have been a loss of fluids, 

 whereas the one described in the paper was discharged entire. It 

 was probable that it had been dead some time, and that there was 

 therefore a stagnation of the blood ; and that, even in the case of a 

 rupture, it wovQd not be so likely to escape as readily as under other 

 conditions. 



Mr. Alfred Sanders read a paper, entitled " Notes on the Zoosperms 

 of Crustacea and other Invertebrata." The paper was illustrated by 

 drawings, and wall appear in another number of the Journal. 



The thanks of the meeting were unanimously voted to Mr. Sanders 

 for his communication. 



Mr. Slack called the attention of Fellows present to some fine 

 slides of Aulacodiscus, which had been presented to the Society by 

 Captain Perry, and also to a tank microscope brought for exhibition 

 by Mr. Eichards ; it had a long shield tube over the object-glass, 

 enabling it to be placed a considerable depth into the water. 



Mr. Eichards said the main object of his contrivance was to be 

 able to bring the object-glass within a focussing distance of the bottom 

 of the tank, where often many organisms were found which would be 

 absolutely destroyed by any attempt to remove them. The tube upon 

 this microscope would allow it to focus to a depth of 8 inches ; it 

 could be used with powers from § to 4 inches, and with any micro- 

 scope which would admit of the tube passing through the stage. 



Mr. T. C. White thought that it would be an advantage if the 

 stand were made so that it could be used for all portions of the tank. 



Mr. Eichards said there was no difficulty in doing that ; his object 

 was in this case only to show the use of the immersion tube. 



Donations to the Library and Cabinet from December 7, 1873 : — 



From 



Land and Water The Editor. 



Nature. Weekly Ditto. 



Athenaeum. Weekly Ditto. 



Society of Arts Journal. Weekly Society. 



Proceedings of tlie Literary and Philosophical Society of 



Liverpool. No. 27 Ditto. 



Spectrum Analvsis as applied to Microscopical Observations. 



By W. T. Suffolk, F.R.M.S Author. 



Jornal de Sciencias Mathematicas Physicas e Naturaes."! Academy of Sciences 



Three Parts / at Lisboa, 



Journal of the Linnean Society, Nos. 73 and 74 . . . . Society. 

 Canadian Journal. No. 79. 



Popular Science Review. No. 50 Editor, 



Thjee Slides of recent Diatoms Capt. J. Ferry. 



Alfred Carpenter, Esq., M.D., J, P., was elected a Fellow. 



Walter W. Eeeves, 



Assist, Secretary, 



