95 



323. Enlarged model of a germinating acorn; the 

 two cotyledons have separated, and the root, as well as 

 the stem with its first leaves, is shown. 



E. 133. 1874. Made by the late Dr. Auzoux, Paris. 



324. Enlarged model of an acorn (fruit of Quercus 

 robur, L.). 



Made by Montaudon (late Dr. Auzoux), Paris. 

 E. 10. 1891. 



The wall of the fruit is shown partly dissected away to show 

 the mesocarp and endocarp. The fruit opens disclosing the 

 testa of the seed, which again opens to show the cotyledons of 

 the embryo, and then also opens showing its plumule and 

 radicle. 



325. Enlarged model of the wood of oak (Quercus 

 communis). 



Made by Montaudon (late Dr. Auzoux), Paris. 

 E. 12. 1891. 



Shows spiral vessels of the protocylen, annual rings of 

 secondary wood, duramen and alburnum, medullary rays, 

 cambium, bast, &c. 



326. Series of models in gutta-percha, papier-mache*, 

 and other materials to illustrate the structure of the 

 flowers and reproductive organs of various plants. 



Made by R. Brendel, Berlin. 



1. Equisetum arvense : a fertile spike with sporangia. E. 

 105. 1880. 



2. Equisetum arvense : a scale from the spike showing the 

 sporangia beneath it ; an embryo in the prothallium ; two spores 

 with their elaters. E. 107. 1880. 



3. Equisetum arvense : the male and female prothallia, the 

 former with antheridia, the latter with archegonia. E. 106, 

 1880. 



4. Pteris serrulata : prothallium showing the section of an 

 archegonium ; sporangium bursting to show the spores escaping ; 

 spore still more enlarged ; germinating spore. E. 108. 1880. 



5. Pteris serrulata: prothallium with antheridia and arche- 

 gonia ; germinating spore, showing the Commencement of the 

 rhachis and the root. E. 109. 1880. 



6. Aspidium Filix-mas : prothallium showing the antheridia 

 and archegonia. E. 16 1884. 



7. Aspidium Filix-mas : prothallium with developing embryo. 

 E. 17, 1884. 



G 2 



