1898] MICROSCOPICAL JOURNAL. 167 



violet, and also the red and yellow. In reply to inquiry, 

 Mr. Ives said that, of course, the light was not strictly 

 monochromatic: it was a mixture of pure green in the 

 spectrum at the Eline, with some yellow-g-reen on one side 

 and blue-green on the other. 



Mr. B. W. Priest exhibited a large number of slides of 

 sponges. He said he had brough a selection which would 

 be found to be characteristic of the order Calcarea and the 

 three sub-orders of Silicea — viz., the Monaxonidaj, Tetrac- 

 tinellidai, and Hexactinellida?, to the last of which he 

 directed attention, on account of their great beauty. 

 There were also some slides of freshwater sponges. 



Quekett Microscopical Club. — The 361st ordinary meet- 

 ing was held June 17th, President, Dr. J. Tatham. Mr. 

 Vezey referred to the death of Mr. Henry Perigal, a mem- 

 ber since 1881. Mr. A. Earland read a "Note on Orbicu- 

 linaadunta F.andM., and its Varieties," based on the ma- 

 terial sent him by Mr. Bryce-Scott, of the Intercolonial Rail- 

 w,iv ot Canada; but the precise locality where found was 

 not stated. It certainly contained an astonishing number 

 of varieties of this species, of which specimens 

 were exhibited, and a type slide was presented by the 

 author to the club. Mr. Rousselet read a paper "On 

 Micro. Cements for Fluid Mounts," which gave rise to 

 an interesting discussion, in which Messrs. Morland, 

 Measures, Nelson, the president, and others took part. 

 Mr. Rousselet said after a lengthened experienced he was 

 obliged to retract part of his former eulogium of Clark's 

 cement, which, while retaining unimpaired spirit mounts, 

 had failed to keep intact watery solutions, such as forma- 

 line, and he had been compelled to remount somehundreds 

 of slides. The general opinion of members seemed to be 

 that it was best to use two, or even three, cements having 

 different solvents, one over another. 



Cheap Books. — Allan Wheeler, Denver, Colo., offers 

 Carpenter's Microscope and its Revelations ($6 book) for 

 $2.00. This is second-hand but good. He also has medi- 

 cal books in great variety. 



