8 Bulletin Wisconsin Natural History Society. [Vol. 8, No. 1. 



the cell. Reproduction by fission, budding, etc., was explained. As to 

 theories of cell reproduction the speaker mentioned two : Weissmann's 

 theory of preformation — that the biophores actually contain all powers 

 and functions of the later cell, and the more recent theory of epigenesis 

 — that the biophores contain these powers potentially. Dr. McGovern 

 accompanied his talk with numerous black-board diagrams. 



Dr. G. W. Peckham spoke on the subject of Parthenogenesis in 

 Animals ; this phenomenon being an adaptation to environment (usually 

 abundant nutritive conditions) , the process of sexual reproduction being 

 in abeyance till condition rose necessitating the animal to reproduce 

 again sexually. Plant lice, ants, wasps, and many other insects were 

 cited as instances. 



Mr. A. C. Burrill then took up the subject of the Development of 

 Fertile Individuals from Neuters in Hymenoptera. Parthenogenesis 

 among insects is perpetual, seasonal, or alternative in generation, the 

 phases of which can be classed as follows : Thelyotoky — when females 

 only are produced, Arrhenotoky — males only, and Deuterotoky — either 

 males or females. 



Mr. Howland Eussel followed by speaking on the Asexually Propa- 

 gating Phenogams of Wisconsin, by means of rhizomes, bulbs, roots, 

 stolons, tubers, runners, bulblets, and leaf-growers. 



The papers presented were then informally discussed by the follow- 

 ing members : Dr. Dernehl, Dr. Graenicher, Dr. Peckham, Dr. M.Govern, 

 and Messrs. Burrill and Eussel. 



Upon motion the meeting then adjourned. 



Milwaukee, Wis., Nov. 18, 1909. 



Eegular meeting of the society. 



President Barth in the chair. 50 people present. 



Minutes of the last regular meeting read and approved. , 



Mr. Howland Eussel moved that hereafter abstracts of lectures 

 and papers presented before the meeting and spread on the minutes be 

 read to the meeting by title only.- Motion seconded and passed. 



President Barth announced that Mrs. Auguste Eeichel, southeast 

 corner Fifth and Sherman Sts, whose nomination had been presented 

 at the last section meeting, had been elected an active member by the 

 board of directors. 



Mr. II. Ward then read the following report: Your committee 

 to consider further action on the resolutions looking to increased pro- 



