Reference for Chullin 111:46

הואיל וקרומו רך אמר ליה רב נחמן לרב ענן מר אמר

R'Yemar used to examine it with water.<span class="x" onmousemove="('comment',' He would first empty the brain matter out of the membrane and then would fill the latter with water; if the water leaked out it is evident that it had been pierced and it would be trefah. Another method of testing by water is to pour water into the hole of the skull and after a few moments to pour it out into a basin; if the water now appears milky it is a clear indication that some of the brain matter as escaped and mixed with this water, and it would be trefah on account of the perforation of the membrane.');">¹⁷</span>

Jastrow

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