LIST, WITH CONTENTS. OF BULLFJINS OF Till- HUKF.AU OF 

 PLANT INDUSTRY XOS. 1 TO loo, 1XCLIS1\1L 



A star (*) before a number indicates that the stock of the Department of Agriculture is exhausted 

 and that collaborators can not be supplied with the bulletin so marked. Similarly, a star before a 

 part of a bulletin shows that this part can not be furnished in separate form. Where a dagger (t) 

 is used, the electrotype plates of the bulletin specified have been destroyed. Where no price is given 

 (in the cases of Bulletins Nos. 5, 16, 21, 2.3, 26, and 28), the publication can not be furnished by ■ 

 the Superintendent of Documents. 



* No. 1. The Ilelation of Liiiu- and Magnesia lo l*lanl (Jrowtli. 



I. Liming of Soils from a Physiological Standpoint. 

 By Oscar Loew. ?2xj)ert in Physiological Chemistry. 



II. Experimental Study of the Relation of Lime and 



Magnesia to Plant (Jrowth. By D. W. May, of the Office 



of Experiment Stations. IDOL 53 pp., 3 pis. Price, 10 



cents. 



Contents: I. Liming of soils from a physiological standpoint : Introduction — 

 Injurious action of maj^-ncsiuni salts — Thforetifal discussion of the functions 

 of lime and magnesia — The ratio between lime and magnesia in soils of differ- 

 ent countries : Soils of America : soils from European countries ; soils from 

 Asiatic countries; soils from African countries; soils from Australia; river 

 deposits — Some special physiological cases relating to the ratio between lime 

 and. magnesia — Correction of lime and magnesia content in soils. II. Experi- 

 mental study of the relation of lime and magnesia to plant growth : Intro- 

 duction — The role of lime in the soil — The role of magnesia in the soil — The 

 object of the experiments — Lime and magnesia as nitrates and sulphates in 

 water cultures: Eesults of experiments with cowpeas ; results of experiments 

 with privet — Lime and magnesia as carbonates in sand cultures : Experiments , 

 with tobacco ; experiments with barley ; experiments with oats, wheat, and 

 beans- — Lime and magnesia as carbonates in soil cultures : Experiments with 

 oats and cowpeas — Lime and magnesia as nitrates in sand cultures : Experi- 

 ments with wheat and oats ; experiments w-ith cowpeas ; experiments with 

 tobacco — Lime as sulphate and magnesia as carbonate in soil cultures : Exper- 

 iments with cowpeas — Summary. 



* f No. 2. Spermatogenesis and Fecundation of Zamia. By Herbert 



J. Webber, Physiologist, Vegetable Pathological and 

 Physiological Investigations, Plant-Breeding Labora- 

 tory. 1001. 100 pp., T pis. Price, 20 cents. 



Contents : Introduction : Summary of recent literature ; acknowledg- 

 ments — Methods and materials used — Development of microspores — Develop- 

 ment of pistillate cones — Development of the pollen tube and prothallus : 

 Germination of pollen and growth of prothallus ; division of second prothallial 

 cell ; appearance and growth of blepharoplasts ; growth of basal end of pol- 

 len tube — Division of the central cell — Metamorphosis of the spermatids — 

 Structure and form of the mature spermatozoid — Movement of spermatozoids — 

 Process of fecimdation — Division of the fecundated egg cell — Is the blepharo- 

 plast a centrosome? — Summary — Bibliography — Explanation of illustrations. 



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