174 Field Museum of Natural History — Reports, Vol. V. 



The Diatoms: a monograph reproducting nine typical species and 

 illustrating the method of conjugation, colonization, and the production 

 of resting-spores; The Conjugatae: a monographic display reproducing 

 ten unicellular and multicellular species also illustration of conjugation 

 in the imicellular type and the formation and ejection of zoospores in 

 the multicellular forms; The Liverworts: a natural-size colony of 

 Marchantia, with enlarged male and female reproductive organs and a 

 series of highly magnified reproductions illustrating both forms of 

 generation; The Horsetails: natural-size reproductions of a whole 

 sterile vegetative shoot, a complete male shoot and a magnified section 

 of a sterile ''cone," also a cluster of sporophores. A number of other 

 pieces were produced and installed awaiting further reproductions in 

 the fam^ilies to which they pertain. They are: The Pepper Family: a 

 reproduction of a bundle of fresh leaves of the Betel Pepper such as 

 are sold in Malayan markets; The Arrow-Root Family: five natural- 

 size flowers of Thalia so disposed as to reveal the peculiar development 

 for fertilization; The Pineapple Family: a natiiral-size branch of a 

 Calabash tree, in fiill leaf, acting as host for a colony of Tillandsias; 

 The Ginger Family: reproduction of a full size, fresh, ripe fruit of the 

 Cardamom as sold in Malayan markets as a vegetable; The Gamboge 

 Family: a leafy tip of a branch of the Mangosteen bearing a full-ripe 

 fruit, three sections of the fruit showing the disposition of the pulp and 

 seeds; The Fig Family: the tip of a leafing Osage Orange branch bear- 

 ing two mature fruits; The Caper Family: an enlarged Spider-flower, 

 a section of the ovary and a fully matured fruit; The Connarad Family: 

 a leafy branch of Connarus bearing a cluster of mature fruits, two 

 fruits opened to reveal the peculiar seed and its aril; The Birch Family: 

 an enlarged portion of a male and a female catkin displaying the essen- 

 tial organs and a still greater enlargement of a stamen; The Screw-Pine 

 Family: reproduction of a mature Pandanus fruit. 



A number of objects and collections in the Department of Geology 

 have been installed in various halls, but as heretofore, owing to lack of 

 space, this has been accomplished in most cases only by removal of 

 other series which had previously been on exhibition. By some readjust- 

 ments in Skiff Hall, a floor case containing about fifty of the largest 

 specimens of copper from Lake Superior presented by Nathan F. and 

 Alfred F. Leopold was installed. Before installation of these specimens 

 they were thoroughly cleaned by immersion in sodiimi cyanide and 

 then carefully coated with shellac by means of an air brush so that 

 they could not again tarnish. At the same time the opportunity was 

 improved to give a similar treatment to a number of other speci- 

 mens of native copper and silver. The valuable collection of Lake 



