272 PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 



Synopsis of the distribution of Alaskan fishes — Continued. 



90. 



91. 



92. 



93. 



94. 



95. 



96. 



97. 



98. 



99. 

 100. 

 101. 

 102. 

 103. 

 104. 

 105. 

 106. 

 107. 

 108. 

 109. 

 110. 

 111. 

 112. 

 113. 

 114. 

 115. 

 116. 



52 



95 



Goregonus MercHi var 



Coregonus chipeiformise 



Goregonus Kennicottii 



Goregonvs quadrilateralis 



Thymallus signifer 



Saivelinus malma 



Salmo purpuratus 



Salmo Gairdneri 



Salmo irideus 



Oncorhynchus chouicha 



Oncorhynchus kcta 



Oncorhynchus nerka 



Oncorhynchus kisutch 



Oncorhynchus gorbuscha 



A Icpidosaurusfcrox 



Alepidosaurus borealis 



Olupea mirdbilis 



Spratelloides bryoporus 



Catostomtis longirostris 



Plilichthys Goodei 



Acipenser medirostris 



Chimcera Golliei 



JRaia binoculata 



Baia parmifera 



Saia batis Pallas 



Squalus acanthias 



Ammottes aureus 



(App.). Icelus hamatus 



(App.). Somniosus microcephalus . 



+ 



IMETMODS OF IHAKIIVC} AIVD PRESERVSNG PLrASTER CASTS. 

 By ANTHONY PIRZ. 



Long Island City, N. Y., 



October 28, 1881. 



Dear Sir : In using the method of preserving plaster casts with baryta 

 water and soap as given some time ago, it happens that larger pieces 

 remain damp a long time (years) and yellow iron spots readily appear on 

 the plaster. V. Decheud, in Bonn, recommends brushing the casts with 

 a hot saturated solution of borax twice, and larger pieces five to six 

 times. Then apply twice a saturated and hot solution of chloride of 

 baryta, and finally a hot solution of soap ; the superfluous soap solution 

 is to be washed off with hot water, and lastly with cold water. The 

 whole treatment occupies but a few hours. 



W. Eeisig, in Darmstad, recommends covering the plaster casts with 

 a solution of India rubber in benzole, or petroleum ether, or bisulphide 

 of carbon. The casts so treated can be washed. 



R. Jacobsen's plan to make plaster casts stand the washing is: 

 to saturate the casts hot with a solution of a most neutral soap from 

 soda lye and stearic acid in 10 parts of boiling water. 



I. W. Platonoff, in Moscow, prepares a mass for casts as follows: 

 tate 50 parts glue, 35 parts wax, and 15 parts glycerine, with 30 per 



