152 ANNUAL OF SCIENTIFIC DISCOVEKY. 



stripes have a contrary effect, and are very ungraceful. Incongruity 

 may be frequently observed in the adoption of colors without reference 

 to their accordance with the complexion of the wearer, as a light blue 

 bonnet and flowers surrounding a sallow countenance, or a pink 

 opposed to glowing red ; a pale complexion associated with a canary 

 or lemon-yellow, or one of delicate red and white rendered almost 

 colorless by the vicinity of a deep red. If the lady with the sallow 

 complexion had worn a transparent white bonnet ; or if the lady with 

 the glowing red complexion had lowered it by means of a bonnet of 

 deeper red color ; if the pale lady had improved the cadaverous hue 

 of her countenance by surrounding it with pale green, which, by 

 contrast, would have suffused it with a delicate pink hue ; or had the 

 face of delicate red and white been arrayed in a light blue, or light 

 green, or in a transparent white bonnet, with blue or pink flowers on 

 the inside how different and how much more agreeable would have 

 been the impression of the spectator ! In general the broken and 

 semi-neutral colors are productive of an excellent effect in dress. 

 They may be enlivened by a little positive color, but the contrasting 

 color should bear but a small proportion to the mass of principal color. 

 A blue bonnet and dress may be contrasted with an orange colored 

 shawl, but the blue to contrast the orange must be of a very deep 

 tone ; a pink bonnet may be worn with a green dress, but the hue of 

 each should be carefully assorted according to their exact contrast. 

 Colored shawls are instances in which a great variety of colors may 

 be arranged with harmonious and rich effect. It is always necessary 

 that if one part of the dress be highly ornamented or consist of various 

 colors, a portion should be plain, to give repose to the eye. The 

 French manufacturers pay great attention to this subject, and the 

 good effects of this study are visible in the textile fabrics which are so 

 highly valued." 



THE PSEUDOSCOPE. 



A NEW instrument, contrived by Mr. Wheatstone, of London, for 

 producing the conversion of the relief of any solid to which it is 

 directed, is called the Pseudoscope, as it conveys to the mind false 

 perceptions of all external objects. It consists of two reflecting prisms, 

 placed on a frame, with adjustments, so that, when applied to the eyes, 

 each eye may separately see the reflected image of the projection 

 which usually falls on that eye. This is not the case when the reflec- 

 tion of an object is seen in a mirror; for then, not only are the pro- 

 jections separately reflected, but they are also transposed from one 

 eye to the other, and therefore the conversion of relief does not take 

 place. The pstudoscope being directed id an object, and adjusted so 

 that the object shall appear of its proper size and at its usual distance, 

 the distances of all other objects are inverted; all nearer objects 

 appear more distant, and all more distant objects nearer. The con- 

 version of relief of an object consists in the transposition of the 

 distances of the points which compose it. With the pseudoscope we 



