. British bee journal & bee-keepers adviser. Bees. Sechon. TWoin- ,in. POLLEN OK BUTTER-BURR When extracted from honey, the water in it causes the processes to swell out and assume the form shown at No. 5. It will then measure from process to process r^in. The same takes place when it is placed direct into water. {To be continued.) COLOUR BLINDNESS IN BEES. A correspondent sends us the following extract on bees and colours :â " It was recently explained by iSir William Ramsay that we are all to a certain, but differing, extent colourblind; which is to say, that there are certain hues
. British bee journal & bee-keepers adviser. Bees. Sechon. TWoin- ,in. POLLEN OK BUTTER-BURR When extracted from honey, the water in it causes the processes to swell out and assume the form shown at No. 5. It will then measure from process to process r^in. The same takes place when it is placed direct into water. {To be continued.) COLOUR BLINDNESS IN BEES. A correspondent sends us the following extract on bees and colours :â " It was recently explained by iSir William Ramsay that we are all to a certain, but differing, extent colourblind; which is to say, that there are certain hues which we may indeed distinguish, but which we do' not nlace in the right order among the gamut of colours. Son- people are blind merely to two colours and are normal for all the rest. Sir Williai i Ramsay is himself an example of tin idiosyncrasy; and it is improbable that any two persons have exactly the same colour vision. But the commonest form of colour blindness is that which per- ceives green and red merely as different shades of grey; and there are reasons for believing that this is a form of colour blindness shared by many orders of animals. It is very difficult, of course, to test animals .because, as Professor W a s h b u r n h a s pointed out, we can never be sure that the animal tested is &L&20&3-- n°t making its dis- .â¢/>â â *â¢>,⢠â¢*â -'.-Va criminations on the ® ground of differing brightness of hue rather than on actual difference of colour; and there is some evidence that this is actually the case among mice. But a series of very interesting experi- ments have lately been made by Pro- fessor K. von Frisch, of Munich, which seem to show that whatever colour sense may be possessed by bees, the ability of distinguishing red as red' is not comprised in it. Von Frisch' carried on his experi- ments on bees in the open air near their hives, and by the aid of what is called the food preference method he found that one day's traini
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