THE NATURALISTS’ BUREAU. 25 
20. PACKARD.— Part 2, 1872. Many cuts .... 25 
21. “ Part 3, 1873. Many cuts .... 25 
22. PACKARD.—Insects and their Allies . ... 15 
23. “ New American Moths, Zygsenidae and 
Bombycidas. 10 
24. PACKARD. — Transformation of the House-Fly. 
With fine Lithographic Plate illustrating the Anatomy . 30 
25. PACKARD. — Synopsis of the Thysanura of Essex 
County, Mass, with descriptions of a few extralimital forms. 
Descriptions of New American Phalaenidse. 
On the Cave Fauna of Indiana. Three valuable pa¬ 
pers in one. 50 
26. SCUDDER.—A Systematic Revision of some of the 
• American Butterflies, with notes.35 
27. WALSINGHAM.—Directions for Collecting Miero- 
lepidoptera. 15 
MICROSCOPY. 
1. B ASTI AN’S Modes of Origin of Lowest Organisms. #1 25 
2. 16 Beginnings of Life. 2 vols., 12mo . . 6 00 
3. BEALE.—How to Work with the Microscope. By 
L. S. Beale. 5th edition. In press. 
4. CARPENTER.— The Microscope and its Revela¬ 
tions. By W. B. Carpenter. Illustrated, 12mo, cloth. 
London, 1875 .. 5 50 
5. CLARK.—Mind in Natur&; or the Origin of Life and 
the Mode of Development of Animals. Over 200 Illustra¬ 
tions. 8vo, cloth. (A most important work on the Anat¬ 
omy and Embryology of all Classes of Animals). . . 4 00 
6. CLARKE.—Objects for the Microscope. . 2nd edition. 
By L Lane Clarke. Revised and enlarged. 1 vol., 12mo, 
cloth . .. 1 75 
7. DAVIES.—The Preparation and Mounting of Mi¬ 
croscopic Objects. By Thomas Davies. 1 vol., 12mo, cloth. 1 25 
This is the best book on Practical Microscopic work in 
the language. It gives full directions for mounting by all 
the various methods. Receipts for all the best mountiqg 
mediums, cements^ varnishes, etc., with instructions for 
dissecting insects and plants, and a guide in the choice of 
parts best calculated to illustrate the structure of the same. 
8. GOSSE. — Evenings at the Microscope ; or, Researches 
among the Minuter Organs and forms of Animal Life. By 
P. H. Gqsse .......... 1 50 
Second hand copy, good condition.1 00 
