1897] MICROSCOPICAL JOURNAL. 297 



heat. A little g-lycerine is added to make the paste pliable 

 and elastic when dr}^, and a little boric acid or thymol, or 

 both, to prevent fermentation. 



DEXTRIN PASTE — MUCILAGE. 



1. Dextrin 50 — 90 parts. 



Alum 4 parts. 



Sugar 75 parts. 



Water 120 parts. 



Carbolic ac d solutiou,io per cent 60 parts. 



Mix. 



2. Gum arable '. 4 parts. 



Water 8 paits. 



Glycerine i part. 



Neutral spirit 3 parts. 



Mix. 



3. Gum arable , 70 parts. 



Water 200 parts. 



Aluminum sulphate 2 parts. 



Dissolve the altiminum sulphate in a small portion of 

 the water, and the g-um arable in the rest, and mix the 

 solutions. This m.ikes a very strong- and excellent mucil- 

 ag-e, the addition of the aluminum sulphate giving- it great 

 streng-th and adhesiveness. 



PASTES CONTAINING GELATIN OK GLUE. 



The following- is recommended to the trade as a most 

 "excellent paste for every possible purpose." 



Gelatin or best glue 2 parts. 



Water 6 parts. 



Pour the water over the g-lue and let stand over nig-ht, 

 or until the g-lue is swollen and soft throug-hout, then put 

 on a water-bath and heat g-ently until the g-lue is melted. 

 Add from 1 to 2 parts of chloral hydrate and let dig-est 

 under g-entle heat for some time. The resultant fluid is a 

 liquid g-lue of g-reat tenacity and keeping- properties. 

 Another formula is as follows: 



Bestglue 40 parts. 



Water 100 parts. 



Treat the g-lue as before, by letting- stand over nig-ht 

 and melting- in the water-bath. In the hot liquid stir 40 



