Allgemeines. — Anatomie. 339 



The gardens of the Royal Botanic Society, in Regents Park, 

 were begun in 1839. 



The gardens of the Royal Horticultural Society were first esta- 

 blished about 1818. 



The arrangement of plants in the gardens is described, and the 

 functions by which the gardens are characterized. "Chelsea and 

 Regents have, in the main played an educational role, whereas 

 Kew Stands out prominently as a centre of Scientfic Research, and 

 as the cradle of botanical enterprise in India and the Colonies. 

 Kew is administered by a government department, the Board of 

 Agriculture, but the Organization and direction of the scientific work 

 are in the hands of the Director." 



The garden of the Royal Botanic Society depends for its existence 

 upon the subscriptions of Fellows of the Society. 



The Chelsea Physic Garden was, in 1893, abandoned by the 

 Society of Apothecaries, and is now supported by grants from the 

 London Parochial Charities and the Treasury. The Professor ol 

 Botany in the Royal College of Science is scientific adviser to the 

 Committee, and the Garden is used by students of the Royal College 

 of Science, and also of the various Polytechnics. The work is very 

 well illustrated, including in addition to many interesting plans and 

 views of the gardens described, photographs of the following plants: 

 Gentimia lutea, Veratruni viride , Iris florentina , Rheiini officinale 

 and R. etnodi hybrid, Rheiini palmatum, Aloe sp. 



W. G. Freeman. 



Holm, Theo, Ruhiaceae: Anatomical studies of North Ame- 

 rican representajtives of Cephalanthiis , Oldenlandia , Hoiistonia , 

 Mitchella, Diodia and Galiiun. (Botan. Gazette XLIII. p. 153 — 186. 

 plates 7-9. March 1907.) 



The development of the rhizome and the internal structure of 

 the vegetative organs are described. Among the points of a more 

 general interest may be mentioned, that the development of cork 

 in the roots of Cephalaiithus takes place immediately inside the 

 exodermis. Fürth ermore that some of the lateral roots in Mitchella and 

 Galiiun pilositm traverse the cortex for some distance before they 

 break through, a peculiarit}^ so far known only i'rom. the Enocaiilaceae 

 and Bromeliaceae. 



The stem shows a rather weak structure, and stereome was 

 only observed in Cephalanthus ; collench3^ma occurs as a closed 

 sheath in Cephalanthus and Diodia, but only as isolated Strands in 

 Hoiistonia purpiirea and the species of Galiiun. Mitchella, Hotistonia 

 coendea and Oldejdandia have no mechanical tissue in their stems. 

 An endodermis was not observed in Cephalanthus, but in all the 

 others. Some peculiar secretory cells were found in the stele of the 

 stem of Mitchella, bordering directly on endodermis, and resembling 

 stereome; these correspond evidently with those described by 

 Solered er as characteristic of Mussaenda, Isertia and Cinchona. 

 In regard to the leaves, these are isolateral in Diodia and Galium 

 trißonnn, though only approximately so. The stomata occur on both 

 faces of the leaf-blade in Hoiistonia coendea and Diodia, but only 

 on the dorsal in the others; their structure is identical with that 

 already known from this family. Epidermal resin-cells were found 

 in Galiiun pilosiun, latifoliinn and circaesans; local thickenings of the 

 lateral cell-walls of epidermis are very characteristic and conspicuous 



