On a netv Mode of yiili/icial Congelation. 411 



Description of the Plate No. 7, [see PI. IV.] 



Fig. I. Presents the end of the radicle just where it is enlarged 

 from the sice root, u a are the iirst forming of the balls, 

 which a:e certainly the hearts of the seeds; and bl t'le 

 larger balls where they take in the little shoot. Lemven- 

 hoek and Mr. H. Baker saw this shoot as well as I. 



2. The alburnum vessels branching up from the root c Cy 

 till they reach the buds passing through the alburnum 

 vessel . 



.?. The bi'd of the encumber cut longitudinally, showing 

 its interior, dd its female flowers, with ee its seed-vessel 

 r.nd seeds, when the hearts of the seeds begin to fix 

 themselves on the seeds f J, and run up the flower-stem 

 S "■. 



•4. The seed-vessel cut horizontally, showing the peculiar 

 \:?.'.v belonging to the first fixing of the seeds, when thev 

 r.ic taking in their hearts to the seeds, as at /; k. 



5. The cutting longitudinally when the seeds receive the 

 jviices of the atmosphere from the peculiar hair i i. 



6. When th.e siime hair is continued and the matter is rc- 

 {•eived from the roots by the peculiar figure k k. 



1 . The horizontal cutting of the stem of the cucumber, 

 showing the apertures wliich admit the powder all the 

 Vi-av up the root within the pith. , 



S, 9, 10. The three hairs: the first begins in the very early 

 bud. 

 11. The sort of excrescence that adnnts the powder, and 

 throws it into the seed at 1 1. 



LXX. On a new Mode of Artificial Congelation. By John 

 Lesuk, F.R.S. E. Professor of Mathematics in the Univer- 

 sity of Edinburgh*. 



We have now to relate a discovery which will enable human 

 skill to command the refrigerating powers of nature; and, by 

 the help of an adequate machinery, to create cold and produce 

 ice, on a large scale, at all seasons, and in the liottest climates 

 of the globe. But, to explain this interesting subject with greater 

 tle.irness and accuracy, it is requisite to trace the successive ad- 

 vances which conducted to the result. Where a conclusion ap- 

 jears simple, the careless observer is apt to suppose it easily at- 



• From Supplement to the fourth and fifth editions of the Encyclo- 

 l.<»:dia Britannic?., vol. iii- P'i:t i. 



taincd; 



