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CONTENTS. 



XXV. — The Structure of Colored Blood-Corpuscles (concluded). By 



Louis Elsbekg, (with Plate XII) 296 



XXVI. — Description of a New Species or Variety of Laud-Snail from 



California. By Robert E. C. .-Steajbmb _-_-_. 316 



f ■ '■'■■"' . 



XXVII. — On Spodumene and its AlteratiDliiC- By Alexis A. Julien.. 318 



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