



1909] BARBER— FRUITS AND SEEDS OF CUCURBITACEAE 265 



thickness of walls; (3) a single layer of sclerenchymatized cells vary- 

 ing but slightly in all the species ; (4) outer and inner parenchyma ; 



inner 



by longitudinally elongated cells; and (6) inner row of thick-walled 

 I cells with granular contents, the author evidently including the 



This is followed by a description of 



erm 



mentioned 



I Von Hohnel 



by the presence or absence on the spermoderm of the inner carpellary 

 layer, is criticized, as Godfrin always found this layer present in 

 fresh material. He used the following grouping, based on the elonga- 

 tion of the cells of the "protective" (third) layer: (1) tangentially 



Citrullu 

 radially elongated cells (Sicyos and Cyclanthera) . The individual 

 descriptions are brief, many details being omitted. 



Fischers, in his classical work on sieve tubes of the Cucurbitaceae, 

 describes a detailed study of the elements in all parts of the plant. 

 The tubes are of four kinds : (1) bundle sieve tubes (usual type found 

 U fibro-vascular bundle) ; (2) ectocyclic (isolated tubes of hypoderm) ; 

 (3) entocyclic (isolated tubes of the inner tissues) ; and (4) commisural 

 (connecting those of the bundle with the isolated tubes). In the 

 young isolated tubes the contents are thickened but in the old there 

 I * a watery slime secreted by the neighboring cells. These isolated 



f " k - * ' ■ ere mistaken by earlier wntere 



turx 



for latex tubes. 



tyenaria 



Mida, Bryonia alba, and Luff a penta 



; Cucurbilo Pepo, 

 pedata, Melollma 



T -F. Hanausek 6 gives chemical analyses of Cucumis sattvus L., 

 - Melo L., C. Chrulhis L., Cucurbita Pepo L., and C. mcxima 

 Ucn -, and mentions briefly the histology of each. 

 Hasz> describes and illustrates cross-sections of species of Cucumis, 

 ^Uus, Lagenaria, and Cucurbita. The numerous species are 

 I dlv,d ed into races, varieties, and subvarieties, with long lists of syno 



5 6 Untersuchungen iiber das Siebrohren-System der Cucurbitaceen. Berlin.^1884. 

 ' Die Nahrungs- und Genussmittel aus dem Pflanzenreiche io5- Kassel. 1 4- 

 ' ^dwirthschaftliche Samenkunde 767. Berlin. 1885- 



