XI. INSTRUCTION. 987 



3850. Three Wall Charts, with representations of the 

 Technical Geography of Plants. 



Prof. Jessen, Eldena, in Pomerania. 



3851. Apparatus for representing the mechanical principle of 

 the Circulation of Sap in Cells. Rough model. 



Prof. Jessen, Eldena, in Pomerania. 



3852. Plan of the Institute of Vegetable Physiology of 

 the University of Breslau, with an account of its arrangements 

 for instruction in the biology of plants. 



Prof. Dr. F. Cohn, Institute of Vegetable Physiology, 



University of Brcslau. 



The Institute of Vegetable Physiology in the Univeisity of Breslau was 

 founded in the year 1866, and was intended (a) for experiments for the eluci- 

 dation of the biology of plants, also for preparing all kinds of demonstrations 

 for the lectures of its director, Professor Ferdinand Cohn, and to found for this 

 purpose collections of apparatus, models, normal and pathological plant forms, 

 herbaria, &c. ; (6) to make the students, by means of courses of instruction 

 on histology, familiar with the use of the microscope for phytobiological 

 researches, and to afford them, by means of a collection of microscopical pre- 

 parations, rich material for observation ; (c) to secure for original researches 

 on the biology of plants the necessary rooms, instruments, and other assistance, 

 as well as direction, and to publish the same as far as possible in the scientific 

 publication of the institute, " Beitrage zur Biologic der Pflanzen ; Breslau, 

 Verlag von Max Miiller." 



3853. Six Models, prepared by A. Lohmeyer, and presented 

 to the collection of botanical models in the Phytophysiological 

 Institute. 



Vaucheria sessilisj development of the Sexual Organs. 



Vaucheria sessilis, development of the Zoospores. 



Eurotium aspergillus, development. 



Models of Antherozoids. 



Models of Zoospores. 



Cypripedium Calceolus, model of the flower. 



Prof. Dr. F. Cohn, Institute of Vegetable Physiology, 

 University of Breslau. 



M. A. Lohmeyer prepared, during the years 1862-67, by the suggestion and 

 under the direction of Professor F. Cohn, an extensive collection of botanical 

 models comprising more than 350 specimens, the first and most complete of 

 its kind which illustrates the structure of flowers and fruits of the phanero- 

 gamic families of plants, with especial attention to officinal plants and the 

 development of the cryptogams. Out of this sprang the collection of botanical 

 models made for sale by Brendel, and exhibited in his name. 



3860. Glazed Frame, Avith movable back for demonstrating 

 biological preparations and drawings. The development of rusts. 

 (JEcidium Berberidis, Puccinia graminis, Uredo linearis.) 



Dr. F. Cohn, Institute of Vegetable Physiology, University 

 of Breslau. 



