CURRENT NOTES AND MEMORANDA. C3 



Mounting Diatoms. — After picking out and mounting singly 

 some specimens of Pkiwosigma, I find that each has collected 

 round it a small quantity of moisture, quite spoiling the markings : 

 the diatoms were prepared with Nitric Acid, and burned on the 

 thin glass cover, and mounted dry with a ring of gold-size. Is 

 the moisture the vapour of the size condensed, or was the acid 

 not properly washed away ? , E. 



We have received Reports and Proceedings of the following 

 Societies : — 



Chichester and West Sussex Natural History and Micro- 

 scopical Society. 



Brighton and Sussex Natural History Society. 



Manchester Scientific Students' Association. 



Specimen Numbers of The British Naturalist and The 

 Canadian Scientific Monthly have been received from Mr. 

 Collins, 157, Gt. Portland St., London. 



Mr. John Wheldon's Catalogue has been received, in which we 

 notice two copies of Leeuwenoek's Select Works, and many other 

 Works relating to Microscopy and Natural History. 



Mr. Fred. Enock sends us a mounted slide of the Marsh-fly, 

 Tetanocera 7'eticulata^ $ in which the whole of the structure and 

 the arrangement of the internal muscles are very beautifully dis- 

 played ; this slide will afford many hours' profitable study. 



Mr. Chas. Collins, Jun., 25, St. Mary's Road, Harlesden, 

 London, has sent us three nicely mounted slides of Heads of 

 Insects. These are: — Head of Earwig, showing the mouth-organs 

 adapted for biting, and Heads of Crane-fly and Oak-fly, in which 

 the mouth-organs are suited for sucking. These objects are 

 mounted without pressure, and the various mouth-organs are well 

 displayed. 



Cement for Glass, Porcelain, &c. — Take soft cheese, grind 

 and wash it in hot water, then when it is freed from all soft matter, 

 and nothing remains but pure caseine, press it in a fine cloth so 

 as to squeeze out all the liquid. There remains a white matter, 

 which is to be dried, reduced to powder, and preserved in a wide- 

 mouthed bottle, or well-fitting box. 



To make use of it, it must be ground up with a small quantity 

 of water, which makes a very adhesive paste. It must be used 

 immediately, and in the cold. 



