S On a Colour for markivg the Ends of Cttlon 



without knowing such creatures had an existence ! (T orrtit 

 the black catalogue of their faults.) 



Then what is life ! what ail its functions too ! 



When largely giv'n to mere ephemera I — 



The animating pow'r is wondroiis cheap ! 



Or much our parent's larg-ess is uhkiiown I — 



Your boast (preheminencc), vain man, forgo, 



Or blush, and turn this gift to more account. 



For if the thinking man is censur'd thus, 



And e'en outrivall'd by a very mite, 



What shame awaits the drowsy sansu'iist. 



Who cats, drinks, sleeps, and toys ; then dies a fool ! 



If these particulars should be thought of sufficient mo- 

 ment to entitle them to a place in your vehicle of philoso- 

 phical information, by laying them before the public you will 

 confer another favour on, sir, yom- already obliged 

 215. Toolev-street, ' Servant at command, 



August lo', 1805. John bNARX. 



Explanation of the Plate. 



Fig. 1. (Plate I.) Back view of the acarus, with the ova 

 attached : also two young ones, showing the comparative 

 size of them with a full grown insect. 



Fig. 2. Abdominal view, showing the manner in which 

 the legs. Sec. spring from the sternum and belly : also 'the 

 comparative length and usual number of hairs which issue 

 from the posterior parts, — in general about thirteen or four- 

 teen. 



II. On a Colour for marking the Ends of Cotton or Linen 

 Cloths capable of resisting the Operations of bleaching, 

 and likewise the most complicated Manufacture of printed 

 Cloths, uithout extending beyond the Limits of the ori- 

 ginal Impression. By M. Hauffman *. 



J. o obtain a colour proper for marking cloths of every 

 kind, it is necessary that no substance or drug soluble in 

 alkaline leys should enter into its composition. It is equally 

 requisite that the substances intended for any compo- 

 sition whatever should not turn white when combined with 

 oxygen ; and that they should remain indissolu!)le in acids 

 of the strength required for bleaching, as well as for the 

 preliminary operations in the fabrication of printed cloths. 

 Colours composed with drying oils cannot, therefore, 

 in my opinion, be employed for this kind of marks, be- 

 cause they are not only liable to be attacked by alkaline and 



, , -. ' From the AnnaU.s de Chimie, No. 158. 



saponaceous 



