I R ISSl LAI I .1 



\< nalogoua ..„i ,,i „| llr | 



•priii; . an unsuspected amnil 



thai il we w< i ve tlie fruit ol > S&uvaf m\ otln i 



\ti component parte, the result would be what we find ii - 

 is it si, nil. ir opinion, considering the II 

 uidolle ol 



i- in the Order, although it might have been expected from 

 vith Clovcworts. Sempervivum tectorum exhibits aln 



I' 1 '" """" of anthers bearing ovulea instead of pollen. Adolpl 



rtain llu .... medullar) raye 



the woody cylinder ol Sempervivum as consisting of little p 



:- immediately around the pith, on die outside ol « Inch an 

 »ith very tin- I -sided dots, arranged in radiating rows, and 



■ annular and reticulal Is. These fil 



ly destitute of medullary pr md are only interrupted in ord< 



v tin- vascular bundles belonging to the leaves, and for the cellular I 

 npanies them. M Urongniart states, however, that this structur 

 ■■■ II On the contrary, he 



portulacacea in the following words : •• In this plant it may I 



at which it arrives in a few years, that there is no wi i| ; in it. 



ilia: very hard tissue, which is found in regular concentric circle in other II 



and which consists of dotted w h fibre and vessels, is entirely wanting ; tin 



M> nothing more than bundles of the medullar) sheath, compos 

 "I"'-- 11 »• ■- with annular and reticulated vessels; but I 



id multiply, so that they ma) be fa m 10 to 50 in an old stem, whi) 

 Ml more than -_'ii or 24 in a young branch. The) then are 2 or 3 millimetn - thi 

 the direction of tlie raj s, instea I ol half a millimetre. Finally, the cellulai - i Inch 



surround, or the pith, itself augments from 4 or 5 millimetn 

 So that i very part continues to grow, whether cellular or vascular ; but the bund 

 the medullar) sheath, thus increased in number an U remain entire!) com] 



sels or false spirals, without intermixtun 

 by hard medullary process s. Thus we have in this Order an exampl. 

 Hennees in the anatomical structure of the trui 



Schleiden fomid in an old stem of an Eeheveria an enl 



"' * '• formed of parenchyma without vessels, and scattered therein 



cords ol very thin-sided parenchyma, in the midst of which ran - 



of which might still be unrolled (W ,1839); and he Buspects that it ma 



to the whole ol this Natural Order. I do not, however, find it in Eeheveria luri . 



■ ut -t. in has a very large pith, and a rii tremely imperl 

 "Inch Bpiral vessels are distributed with great irregularity. 



It appears, from DeCandolle's researches, that of thi . which hi - 



Urder to consist, 133 are found at t) I of <i 1 Hope, - 



I the tropics. 2 in the same country within the tropics, none in thi Weal 

 or the Mauritian Islands, 8 in Mexico, 7 in the I nited States, 12 in - 



'" Europe, IH in the Canaries, I in Southern Africa beyond the lira I 

 bary, 3 in the East Indii -. 4 in China and Japan, and 2 in - 

 " ,l " to be added several species from the Himalayas, The) 



situations, where not a blade of grass nor a particle ol moss ca 

 rocU, old walls, sandy hot plains, a] tenia u I) expi - I to thi 

 the fiercest ray- ol the noon-da) sun Soil is to them a somethii 



ithi r than a source of nutriment, which in these plants 

 mouths, invisible to the naked eye, but covi ring all thi 

 cellular tissue which lie beneath thi m. 



ant and abstergent projiei ti. s, mixed sometimi s with - 

 distinguish them. The fishenm u of Madeira rub their nets 



or Sc npervivum glutinosum, bv which thi 

 tanned, provided they an alkaline liquor. Mi 



Mvum tectorum combined with lime. Kalanch 

 boo to il;, g, ,,,.,..,| .„. n ,| .,,,,[ Btimulating propertii - 



refrigeranl ; and tins is the common quality of the 



oi Dioscorides, and Sempervivum teeter i 

 ' IVlephium is another, and also astringent : 

 ry people in diarrhoea Its acridity on tlie other 



■ rubefacient emetic and pnrgativi Bryophyllura 



